1. The problem statement, all variables and given/known data We did a Prac where we attached ticker tape to a cart (905g), and the cart to a mass (249g) through a pulley. We then had to assess the tape and answer questions. We are asked to calculate the force acting upon the whole system and then calculate the force acting only upon the cart. We are not given the coefficient of friction. I do not know the applied force (can I work this out?) Average acceleration = 1.05m/s (initial velocity was zero/at rest?) There is no inclination. The cart was on a flat, smooth desk. 2. Relevant equations F=ma a(av)= v-u/t Maybe Ek=1/2mv2 3. The attempt at a solution Read somewhere that Ek=1/2mv2 can give you the coefficient of friction, but that didn't seem right at all. Other than that, completely lost.